EP3209917A1 - Distributeur à commande assistée - Google Patents

Distributeur à commande assistée

Info

Publication number
EP3209917A1
EP3209917A1 EP15791498.7A EP15791498A EP3209917A1 EP 3209917 A1 EP3209917 A1 EP 3209917A1 EP 15791498 A EP15791498 A EP 15791498A EP 3209917 A1 EP3209917 A1 EP 3209917A1
Authority
EP
European Patent Office
Prior art keywords
pilot
stage
piston
valve
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15791498.7A
Other languages
German (de)
English (en)
Other versions
EP3209917B1 (fr
Inventor
Frank Schulz
Markus Bill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydac Fluidtechnik GmbH
Original Assignee
Hydac Fluidtechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hydac Fluidtechnik GmbH filed Critical Hydac Fluidtechnik GmbH
Publication of EP3209917A1 publication Critical patent/EP3209917A1/fr
Application granted granted Critical
Publication of EP3209917B1 publication Critical patent/EP3209917B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
    • F16K31/406—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston
    • F16K31/408—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston the discharge being effected through the piston and being blockable by an electrically-actuated member making contact with the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
    • F16K31/406—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston

Definitions

  • the invention relates to a pilot-operated directional control valve, in particular directional control valve, with a valve housing, with at least three fluid connection points with a main control stage and a pilot stage.
  • a solenoid valve for the control of a fluid is known, with a first housing part with an axial guide for a magnet armature, which is displaceable under the action of a, the first housing part outwardly at least partially surrounding magnetic coil in the axial guide , with an energy storage device, and with an actuating part acting on a valve closure member.
  • the valve closure member has a check valve for controlling a bypass bore in the valve closure member, whose check valve closing member receiving and movably holding housing is integrally formed with the valve closure member and that the housing due to a change in shape after the onset of stop valve closing member holds this in its respective functional position
  • a solenoid valve is due to the above-described structural design of the check valve housing simplified executable, especially in relation to the required manufacturing tolerances.
  • the known solenoid valve solution has a main control stage and the main control stage controlling pilot stage, which is actuated via the armature as part of a magnetic actuation system.
  • Such solenoid or directional valves are basically used in fluid systems for controlling volume flows.
  • pilot operated directional control valves are particularly well suited if you want to switch high pressures and high flow rates, since the flow forces and friction forces can be largely compensated.
  • the use of a pilot stage for the main control stage achieves a very good ratio of installation space and flow resistance in the sense that a high level of performance can be achieved in a small installation space.
  • Pilot-operated directional control valves in seat design lead to cost-effective valves with high hydraulic performance at the same time.
  • Regular requirements are a high pressure of, for example,> 350 bar and a high volume flow, for example> 200 l / min at a pressure difference of about 5 bar.
  • a very high valve dynamic is required.
  • the above-specified, known solenoid valve solution is designed in the manner of Einschraubpatrone or cartridge valve solution for installation in an overall valve block, so that the known solution is advantageous and space-saving in the manner of a modular valve concept can be used;
  • the known solution leaves nothing to be desired.
  • the present invention seeks to provide a pilot operated directional control valve, in particular in the form of a directional seat valve, which has a very high switching capacity and high valve dynamics and is reliable in use and can be produced inexpensively. This object is achieved by a directional control valve with the features of patent claim 1 in its entirety.
  • a valve concept realize that has a kind of three-stage control structure and thanks to the intermediate stage can be very large volume flows dominate over the pilot stage, so that can achieve a very high valve dynamics, in particular inhibits and substantially resistance free the fluid in the form of hydraulic oil on the Intermediate stage and the pilot stage are pushed out to the tank side.
  • a very high switching capacity is achieved with a relatively small three-stage directional seat valve. This has no equivalent in the prior art.
  • the valve housing in the manner of Einschraubpatrone in a valve block with fluid guides can be accommodated, which can be brought into fluid-conducting cover with the fluid connection points of the valve housing into which the intermediate stage in the manner of another second Einschraubpatrone can be integrated , And that the pilot stage in the manner of another third Einschraubpatrone is fixable in the intermediate stage.
  • the diameter of the respective Remove screw-in threaded sections from the valve housing in the direction of the pilot stage can be accommodated, which can be brought into fluid-conducting cover with the fluid connection points of the valve housing into which the intermediate stage in the manner of another second Einschraubpatrone can be integrated , and that the pilot stage in the manner of another third Einschraubpatrone is fixable in the intermediate stage.
  • the diameter of the respective Remove screw-in threaded sections from the valve housing in the direction of the pilot stage can be accommodated, which can be brought into fluid-conducting cover with the fluid connection points of the valve housing into which the intermediate stage in the
  • Cartridge valve construction technology allows a modular structure of the individual components of the directional control valve in the form of the main control stage, the pilot stage and the intervening intermediate stage.
  • various valve components of different performance design can be easily combined with one another via the individual components in the form of screw-in cartridges so that fluid control tasks can be functionally and cost effectively controlled in a wide range of applications.
  • the main piston of the main piston stage at least two channel guides, each provided with a valve, preferably in the form of a check valve, the respective highest fluid pressure of two fluid connection points of the valve housing, which are separated from each other by means of the main control piston , Forward in a discharge space, which is connected via the controlling intermediate stage with actuated pilot stage to the third fluid connection point, which preferably has a tank or ambient pressure.
  • the respective highest pressure can then be reported via the non-return valves to the rear side of the main control piston, which is pressed into its valve seat in the valve housing by the abovementioned pressure and optionally under the influence of an additional energy store, for example in the form of a compression spring.
  • the otherwise fluid-carrying connection between the two fluid connection points is then sealed seat-tight.
  • the intermediate stage individual Kanalabschnit- te, which meet in pairs at a kink or other deflection to create space for a center space, which is connected to the third fluid connection point permanently fluid leading, and which is closed by the pilot piston of the pilot control.
  • the pairwise connected to each other at the assignable kink channel sections form a bypass channel, which opens with its one free end in the discharge chamber and with its other free end in a pilot space of the pilot stage.
  • the fluid guidance is achieved via the respective relatively large dimensionable bypass channel within the intermediate stage, so that very high fluid flows can be actuated via the pilot stage, which in this respect accommodates the required high switching capacity and high valve dynamics.
  • the surface ratio of the main control and pilot piston is selected in each case such that the sum of the pressure-effective piston surfaces on the front of the respective control piston corresponds to the pressure-effective total area on the back of this control piston. In this way, a total of two large valve opening area is generated in two stages, whereby the fluid pressure collapses quickly, which in turn benefits the high momentum of the valve according to the invention.
  • valve solution according to the invention is explained in more detail using an exemplary embodiment according to the drawing. This show in principle and not to scale representation of the Fig. 1 in the manner of a longitudinal section of the pilot operated directional control valve as a whole;
  • the pilot-operated directional control valve shown in FIG. 1 is designed in the manner of a directional seat valve which has a valve housing 10 with at least three fluid connection points 12, 14 and 16 and a main control stage designated as a whole by 18 and a pre-control stage designated as a whole by 20.
  • the fluid port locations 12 and 14 may once constitute a pressure supply port for connection to a pressure supply source and may be a consumer port for connecting a hydraulic load. Depending on the particular pressure situation with regard to the pressure supply source and / or the hydraulic consumer, the higher pressure may be present once at the fluid connection 12 or once at the fluid connection 14.
  • the further third fluid connection 16 forms a tank or return connection, so that in this respect at the fluid connection -Stelle 16 a tank or ambient pressure prevails.
  • main control stage 18 and the pilot stage 20 are designated as a whole with 22 intermediate stage and the main control stage 18 and the pilot stage 20 have a longitudinally movable main control piston 24 and a lijnsverfahrbaren pilot piston 26.
  • intermediate stage 22, in particular Fig. 1 shows, stationary received in the valve housing 10 and at least partially integrated with its bottom in the valve housing 10.
  • the valve housing 10 can be accommodated in the manner of a screw-in cartridge in a valve block, not shown, with fluid guides, which are in fluid-conducting covering with the respective fluid connection points 12, 14, 16 of the Valve housing 10 can be brought.
  • the intermediate stage 22 is likewise designed in the manner of a further second Einschraubpatrone, which is insertable into the valve housing 10 in the manner of the first Einschraubpatrone.
  • the pilot stage 20 is formed in the manner of another third Einschraubpatrone which is fixed in the intermediate stage 22.
  • a corresponding screw-in cartridge solution is also referred to in technical terms as a "cartridge valve assembly.”
  • the diameters of the respective screw-in threaded sections 28, 30, 32 decrease at approximately the same axial run-in distance, starting from the valve housing 10 in the direction of the pilot stage 20.
  • the valve housing 10 expands from the bottom to the top in a staggered manner and the individual fluid connection points 12, 14, 16 are separated from one another in a customary and therefore unspecified manner via annular seals the valve housing 10 is fixed screwing in the valve block, not shown, of an overall hydraulic system.
  • the main control piston 24 is in its seat-tight closed position, in which the two fluid connection points 12, 14 are separated from each other in a fluid-tight manner.
  • the valve seat 34 is formed by inclined contact surfaces on the lower free end face of the main control piston 24 and from the assignable wall parts of the valve housing 10, which include the fluid connection point 12.
  • the main control piston 24 of the main control stage 18 has at least two channel guides 36, 38 which are each provided with a check valve 40, 42, which results in particular from the illustration of FIG. 2.
  • the check valve 40 shown on the left with its valve ball in an open fluid ferryden position
  • the check valve 42 shown on the right is located with its closing ball adjacent to a ball seat of the main control piston 24 in the closed position.
  • the valve balls of the check valves 40, 42 in their respective open th position the associated channel guide 36 and 38 can not leave, the end a disc-shaped valve limit 44 is provided, which is held via a snap ring 46 at the upper free end of the main control piston 24, which merges into a peg-shaped extension 48.
  • the upper free ends of the two channel guides 36, 38 terminate in a common relief space 50, which is at least partially encompassed by the housing parts at the lower end of the intermediate stage 22. Otherwise extends in an outer region of the discharge chamber 50, an energy storage in the form of a first compression spring 52, which is supported with its one free upper end to the stationary in the valve housing 10 arranged intermediate stage 22 and with its other lower free end on the longitudinally movable in the valve housing 10 Main control piston 24.
  • the intermediate stage 22 has individual channel sections 54, 56; 58, 60, which meet in pairs at a kink 62 to provide space for a center space 64 which is connected to the third fluid connection point 16 permanently fluid leading, said pertinent center space 64 from the pilot piston 26 of the pilot stage 20 and a subsequent explained closure body of an actuating part 86 is closed.
  • bypass channels 66, 68 include "O-leg-like" the middle space 64, seen in the direction of Fig.
  • a collection channel 70 which opens into a transverse channel 72, in turn, the end fluidly leading to 1 is connected at its lower end via a transverse guide into the third fluid connection point 16, at which the tank or ambient pressure prevails formed by a bore in the intermediate stage 22, wherein the bore opens into a portion which widens conically upwards, and the conical expansion space is of the lower free end face of the housing of the pilot stage 20 limited.
  • bypass channels 66, 68 open at the bottom into the relief chamber 50, they open with their other free upper end into a pilot control chamber 78 of the pilot stage 20.
  • bypass channels 66, 68 can not only extend within the plane of the drawing, as shown, but in principle there is also the possibility that they form additional fluid guides within the intermediate step 22 from the plane of the drawing.
  • the pilot chamber 78 is on the inner peripheral side in holes 80 of the housing of the pilot stage 20, whose free opening cross-section of the pilot piston 26 can be specified with.
  • the pertinent pilot piston 26 has in the region of the bores 80, a diaphragm or throttle 82 which is permanently connected fluidly connected to a piston chamber 84 of the pilot piston 26, which is penetrated by a rod-shaped actuating member 86 of a designated as a whole with 88 magnetic actuation system in which Actuation is a fluid-leading path between pilot chamber 78, piston chamber 84 and center space 64 of the intermediate 22 is released. Furthermore, the pilot piston 26 has at its one free end face, which faces the central space 64, a connecting channel 90 opening out to this end, which opens on its side facing the actuating part 86 of the magnet system 88 into a diaphragm or throttling point 92, which opens in the unactuated state.
  • the pilot piston 26 has an adjacent to the pilot chamber 78 annular piston surface 87 at which a force is introduced into the pilot piston 26 as a result of the pressure applied to this. This force is opposite to a counterforce which is present at the effective rear-side overall piston surface of the pilot piston 26 and results from the pressure prevailing inside the piston chamber 84 pressure.
  • This rear overall piston surface is composed of several piston surfaces, to which
  • the magnet system 88 has a magnet armature 94, which is guided in a pole tube housing 96 so as to be longitudinally movable.
  • the magnet armature 94 is braced against a further energy store in the form of a compression spring 98, so that the magnet system 88 is designed as a so-called "pulling magnet", ie in the case of energization of an actuating coil not shown in detail, which is customary in the case of magnetic systems 88 is, the magnet armature 94 is moved against the action of the compression spring 98 as seen in the direction of FIG. 1 moves upwards, taking the rod connected to it like actuating part 86, so that the closure tip arranged at the free end releases the orifice 92 in the pilot piston 26.
  • a further compression spring 100 is provided as an energy store in order to hold the actuating part 86 in its closed position shown in FIG.
  • the magnet system itself is again set in cartridge or cartridge design in the valve housing 81 of the pilot stage 20 via a screw-in distance 102, in which respect the diameter of the additional screw-in distance 102 compared with the previous screw-in lengths 28, 30, 32 is also again reduced in diameter.
  • the directional valve is to provide that the area ratio of the main control piston 24 and pilot piston 26 is selected in each case such that the sum of the pressure-effective piston surfaces on the front of the respective control piston corresponds to the effective total area on the back of this control piston.
  • the pressure on the back of the main control piston 24 must be lowered, corresponding to the piston surfaces to less than half the supply pressure of port 12 or port 14.
  • the pilot stage 20 is actuated by the closure body by means of the magnet Actuation system 88 from its valve seat, speak the third valve seat, is lifted. Since the piston space 84 under high pressure is now connected to the center space 64, which is only under tank pressure, the pressure in the piston space 84 collapses. As a result, the said opposing force which pushes the piston 26 in its closing direction drops away so that the force lifts the pilot piston 26 from its valve seat 76, that is to say the second valve seat, as a result of the pressure still partly present at the annular piston surface 87.
  • the very narrow pilot control orifice 82 causes the pressure inside the pilot control chamber 78 to not collapse as quickly as in the piston chamber 84. Since the flow cross section at the second valve seat 76 is relatively large, the pressure within the relief chamber 50 is reduced very rapidly, so that the main control piston 24 relatively quickly lifts off its valve seat 34 in the short term. Both the fluid displaced by the main control piston 24 and the fluid flowing through the channel guides 36, 38 also flow via the large flow cross-section at the second valve seat 76 to the tank and return passages - conclusion 16. When the pilot stage 20 is actuated via the magnet system 88, the pressure at the pilot control diaphragm 82 collapses and thus also in the pilot control chamber 78.
  • the center chamber 64 is then relieved of pressure via the third fluid connection point 16 to the tank or ambient pressure with the consequence in that, under the effect of the fluid pressure at the fluid connection points 12 or 14, the main control piston 24 now moves substantially further upwards only against the pressure of the compression spring 52, thus releasing a larger connection cross section between the fluid connection points 12 and 14.
  • the valve according to the invention can allow high valve dynamics due to its three-stage design with high switching capacity.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

Distributeur à commande assistée, en particulier distributeur à siège, qui comporte un boîtier (10) de distributeur présentant au moins trois sites (12, 14, 16) de raccordement fluidique, et un étage de commande principale (18) et un étage de commande assistée (20), caractérisé en ce qu'un étage intermédiaire (22) de commande de fluide supplémentaire est situé entre l'étage de commande principale (18) et l'étage de commande assistée (20), et en ce que l'étage de commande principale (18) comporte un piston de commande principale (24) mobile longitudinalement et l'étage de commande assistée (20) comporte un piston de commande assistée (26) mobile longitudinalement.
EP15791498.7A 2014-10-22 2015-10-14 Distributeur à commande assistée Active EP3209917B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014015704.0A DE102014015704A1 (de) 2014-10-22 2014-10-22 Vorgesteuertes Wegeventil
PCT/EP2015/002027 WO2016062383A1 (fr) 2014-10-22 2015-10-14 Distributeur à commande assistée

Publications (2)

Publication Number Publication Date
EP3209917A1 true EP3209917A1 (fr) 2017-08-30
EP3209917B1 EP3209917B1 (fr) 2018-09-19

Family

ID=54478694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15791498.7A Active EP3209917B1 (fr) 2014-10-22 2015-10-14 Distributeur à commande assistée

Country Status (4)

Country Link
US (1) US10400912B2 (fr)
EP (1) EP3209917B1 (fr)
DE (1) DE102014015704A1 (fr)
WO (1) WO2016062383A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022112275B4 (de) 2022-05-17 2024-08-01 Technische Universität Dresden, Körperschaft des öffentlichen Rechts Vorsteuerbares hydraulisches Sitzventil und Anordnung zur Spülung eines hydraulischen Ventils

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072752A (en) * 1991-03-14 1991-12-17 Sterling Hydraulics, Inc. Bidirectional cartridge valve
DE4218894A1 (de) * 1991-06-07 1992-12-10 Rexroth Mannesmann Gmbh Folgeventil
JP3069515B2 (ja) 1995-11-24 2000-07-24 新キャタピラー三菱株式会社 電磁比例リリーフ弁
DE10106892A1 (de) 2001-02-16 2002-09-05 Mannesmann Rexroth Ag Vorgesteuertes 2/2-Wege-Sitzventil
US6869060B2 (en) * 2003-04-04 2005-03-22 Husco International, Inc. Hydraulic poppet valve with force feedback
DE10325177A1 (de) 2003-06-04 2005-01-05 Hydac Fluidtechnik Gmbh Ventil
US6971232B2 (en) 2003-07-22 2005-12-06 Eaton Corporation Hydraulic drive system and improved control valve assembly therefor
US20070290152A1 (en) 2006-06-16 2007-12-20 Pengfei Ma Poppet valve
US8256739B2 (en) * 2008-12-22 2012-09-04 Husco International, Inc. Poppet valve operated by an electrohydraulic poppet pilot valve
DE102009006445B3 (de) * 2009-01-28 2010-07-15 Hydac Fluidtechnik Gmbh Proportional-Druckregelventil
DE102009051574A1 (de) 2009-10-26 2011-05-05 Hydac Fluidtechnik Gmbh Magnetventil
DE102012006681A1 (de) * 2012-03-30 2013-10-02 Hydac Fluidtechnik Gmbh Ventil, insbesondere vorgesteuertes Proportional-Druckregelventil

Also Published As

Publication number Publication date
DE102014015704A1 (de) 2016-04-28
WO2016062383A1 (fr) 2016-04-28
US10400912B2 (en) 2019-09-03
EP3209917B1 (fr) 2018-09-19
US20170321820A1 (en) 2017-11-09

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